package exsun.jt808.data.util;

public class GpsCorrectUtil {

    private static double pi = 3.14159265358979324;
    private static double a = 6378245.0;
    private static double ee = 0.00669342162296594323;


    /*
    将84坐标系坐标转换为高德坐标系坐标
     */
    public static double[] Wgs84ToGcj02(double wgsLat, double wgsLon)
    {
        double[] result = new double[2];

        if (outofChina(wgsLat, wgsLon))
        {
            result[0] = wgsLat;
            result[1] = wgsLon;
        }

        double[] oDelta = Transform(wgsLat, wgsLon);

        result[0] = wgsLat + oDelta[0];
        result[1] = wgsLon + oDelta[1];
        return result;
    }


    public static Boolean outofChina(double lat, double lon)
    {
        if (lon < 72.004 || lon > 137.8347)
            return true;
        if (lat < 0.8293 || lat > 55.8271)
            return true;
        return false;
    }

    private static double[] Transform(double lat, double lon)
    {
        double[] result = new double[2];
        double a = 6378245.0; //  a: 卫星椭球坐标投影到平面地图坐标系的投影因子。
        double ee = 0.00669342162296594323; //  ee: 椭球的偏心率。
        double dLat = TransformLat(lon - 105.0, lat - 35.0);
        double dLon = TransformLon(lon - 105.0, lat - 35.0);
        double radLat = lat / 180.0 * pi;
        double magic = Math.sin(radLat);
        magic = 1 - ee * magic * magic;
        double sqrtMagic = Math.sqrt(magic);
        dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
        dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
        result[0] = dLat;
        result[1] = dLon;
        return result;
    }


    private static double TransformLat(double x, double y)
    {
        double ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.sqrt(Math.abs(x));
        ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0;
        ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0;
        return ret;
    }

    private static double TransformLon(double x, double y)
    {
        double ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x));
        ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0;
        ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0 * pi)) * 2.0 / 3.0;
        return ret;
    }





}
